930 engine and Trans going into an sc. What do I need to know?

[Tremelune]

At the risk of sidetracking this whole thread, is that so? I drove a bone stock 930 once, and it was dead until the boost came on (and then man!). The 3.6 is instant, endless power from like 2000 RPM...Modern turbos and fuel delivery changing the game?

[Ronnie's.930]

Originally Posted by racerboyrt

This will be a much much easier project if you use your 915. Sell the turbo box and build up a more stout modded 915 while you dial in everything with the swap. Once your current 915 gives up put in the rebuilt one and it should be pretty reliable. Turbo + 5 speed is way fun.

This is only advisable if the OP wants to spend all of his time worrying about breaking the 915 transmission rather than enjoying his time behind the wheel.

As others have mentioned, even when built, a 915 does not stand a chance against a 930 engine (this has been proven time and again by many people that have tried to use them). And the people that do make them "sort of" last, say that they do so by absolutely babying the throttle.

[Tremelune]

In the interest of actually contributing to this thread, here's a pretty good read on the 915 with more power:

915 trans with 400 hp turbo motor

TL;DR - If you don't drag race, the 915 will be fine up to about 300hp.

[Ronnie's.930]

Originally Posted by Tremelune

At the risk of sidetracking this whole thread, is that so? I drove a bone stock 930 once, and it was dead until the boost came on (and then man!). The 3.6 is instant, endless power from like 2000 RPM...Modern turbos and fuel delivery changing the game?

Even with the original, garbage turbocharger (3K 3ldz), the max torque numbers in stock trim were just barely below the max horsepower, but of course, the powerband was very narrow due to the ridiculously slow spooling turbo. Change to any number of available turbos that spool earlier and you then have an impressive, lowish RPM ground pounder on your hands. No need to change the fuel delivery system for that.

[Matt Monson]

My gear width picture on pg 2 of the linked thread tells the real story. It's not about shifters or bearing plates or even ring and pinions. It's gear size.

[Ronnie's.930]

Originally Posted by Matt Monson

My gear width picture on pg 2 of the linked thread tells the real story. It's not about shifters or bearing plates or even ring and pinions. It's gear size.

Matt, I remember reading your posts about this in the Turbo forum some time back (along with pictures), and it really helped to explain why the 915 is a poor choice for a 930 engine (even with the typical mods that people try to do to them) - really learned a lot from you about that.

[Tremelune]

In the interest of actually contributing to this thread, here's a pretty good read on the 915 with more power:

915 trans with 400 hp turbo motor

TL;DR - If you don't drag race, the 915 will be fine up to about 300hp.

[Ronnie's.930]

Originally Posted by Tremelune

TL;DR - If you don't drag race, the 915 will be fine up to about 300hp.

The trouble with this is that the 930 engine will make over 300 hp with very little work done to it. For example, if the OP does not run the stock USA catalytic converter and muffler combination, he will be at, or close to, 300 hp, and if he chooses to use a better than stock turbo & intercooler, he'll be well beyond that mark.

[fastfredracing]

Don't forget the oil tank, it has an extra fitting for the scavenge pump line

[Ronnie's.930]

Originally Posted by fastfredracing

Don't forget the oil tank, it has an extra fitting for the scavenge pump line

A simple, and MUCH improved over factory, fix for that is to run the scavenge pump discharge hose to the crankcase breather cover (a hole must be drilled and a fitting added, of course). That way, the oil from the turbocharger is no longer dumped into the oil tank where it is then sent into the engine unfiltered (potentially sending oil coke particles throughout the engine - plugging the cam spray bars is the most noted result). That was definitely a horrible factory design that many have suffered from . . .

[Bob Kontak]

Originally Posted by Ronnie's.930

The 930 engine produces a tremendous amount of torque, too - that's why it makes shredded wheat out of even "built" 915 gearboxes.

That's not so good, right?

I kind of liked the "keep the original" 915 post. Made sense except for not being able to use the engine's power except for over 50 mph in a straight line.

It sounds plausible but you are handcuffed.

[Ronnie's.930]

Originally Posted by Bob Kontak

. . . but you are handcuffed.

That's not always a bad thing, right?!?!

[Bob Kontak]

Originally Posted by Ronnie's.930

That's not always a bad thing, right?!?!

That's my younger sister. Where the hell did you get that?

Calling her now. Furious.

[Ronnie's.930]

Originally Posted by Bob Kontak

That's my younger sister. Where the hell did you get that?

I just took that picture - he he he! Sorry bro, but I just couldn't say "NO"!

[patkeefe]

My little 275 HP SC hasn't killed the 915 transaxle yet. I do have to yank it pretty hard into 2nd, however.

[Bob Kontak]

Originally Posted by Ronnie's.930

I just took that picture - he he he!

Have fun. She's pretty easy.

Stealing a movie line, she says I kiss the best.

[quattrorunner]

So I do have something to add. I did in the 930 forum but somehow no one looked there.
Anyway, you'll need
I'm doing it now as well. For sure the axles are not the same, the length of the trans will probably cause some interference at the tunnel area, and the trans support mount is not going to line up among other things. Clutch cable, shifter etc..
It's doable but not today my friend.
You need carrera axles from 86-89, a 930 clutch cable I believe, 930 shifter, and then you need to molest the trans support for it to line up. Once it lines up you most likely will be hitting the torsion tube with the front of the transmission.
Keep us posted please good luck.

[dzlndan]

Originally Posted by racerboyrt

This will be a much much easier project if you use your 915. Sell the turbo box and build up a more stout modded 915 while you dial in everything with the swap. Once your current 915 gives up put in the rebuilt one and it should be pretty reliable. Turbo + 5 speed is way fun.

I would love to hear more on this idea. Not to hijack or side track this thread, but is there any recommended threads on this?(more stout modded 915). I'm boosting a 3.0 (I know I'm crazy) but I need to break open my gearbox anywho because of syncros and I don't wanna go thru what this poor guy is going to go thru. I had the same thoughts on trying to locate a 4sp but now not sure that's the best idea.

[Bob Kontak]

Originally Posted by patkeefe

My little 275 HP SC hasn't killed the 915 transaxle yet. I do have to yank it pretty hard into 2nd, however.

I would just be scared with the 930 motor/915 gear box set up to give it the beans with no speed built up.

But that's me and I have no base of experience platform to speak from.

[quattrorunner]

Btw the 915 is a hoot with the 930 engine. It blasts to 160 so fast you'll be shocked. But. You'll worry about the lower gears all the time and if you look at me you'll unserstand. I got no more hair. It's all because of that 915 gearbox. And I've been through two of them. They really don't like the torque of the 930 gearbox. I used stock boost too. Even if your at or under 300hp the torque on this engine is more than that. Realistically it's more like 325-350lbft. That's a lot.
This is why I'm going 930. And then my limits won't be 915 gearboxes. It will be fuel but I won't run into any limits till around 400hp so sit n think on that for a minute. With the 930 gearbox you can do that. It's just a twist away from more power with these cars.
I've been in a 3.6 equipped 911sc and it doesn't hold a candle. Turbo power is king!!!
Flame on.